Hot-nut press



April 2o 192s. 14,581,632

A A. DE FRlES HOT NUT PRESS Filed June 6, 1924 n l u n Patented Apr. 20,1926.

ALFRED DE FRIES, OF CASSEL, GERMANY.

l 1,581,632 PATENT OFFICE.

HOT-NUT PRESS.

Application filed .Tune 6, 1924. Serial No. 718,350.l

To all whom 15m-ay conce-rn:

Be it known that I, ALFRED DE Finns, a citizen of the German Republic,residing at Cassel, Germany, have invented certain new and usefulImprovements `in Hot-Nut Presses, of which the following is aspeciication.

In hot nut presses, the tool slides of which have anirregular forwardand backward stroke, the movement of the slides cannot be controlled bya simple crank drive and a cam drive has to be used. In `pre-:ses theslide of which has to be rapidly advanced from the position of rest thecam strikes strongly on the rear part of the slides. This blow-likepressure of the cam` does however not act in the-direction of thehorizontal axis of the slide but at an angleto this axis from above.This shock is transferred bythe slide tothe lower surface of the rearpart of the slide and on the guides wherefrom results a comparativelystrong I wearing of these parts after a short time of service of thepress. As the front part of this slide is not exposed to thisv rapidwear the slide and its tool will evidently adopt. after a comparativelyshort time, an oblique position with regard to the correspondingcounter-tool arranged opposite so that an accurate engagement of thesetools and consequently a uniform working is no longer possible. Theparts submitted to wear must therefore be frequently repaired. This wearis especially -perceptible when two slides are arranged the onel in theother as is the case for all nut presses provided with stock-saving'devices.

The inconvenience of the rapid wear of the slides and of the guides forthe saine is avoided according` to the invention by the insertion,between 'the pressure cam and the slide,`of a mechanism which transformsthe cam pressure action on the slides inv an inclined direction fromabove linto a pressure which acts in a line substantially parallel tothe slide.

An embodiment of the invention in its application to a hot nutv press isshown by way of example on the accompanying drawin in which z- `ig.` 1shows in longitudinal section the punch slide and the hole punch slide.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 isa section on line A--B of Fig. 1.

Figfl is a section on line C-D of Fig. 1.

On the main slide l containing the die plate2 and the die 3 two slidesare arranged viztherpunch slide 4 containing the punch 5 iandjrthe slide6 containing the piercing element 7. The main slide 1 glides on theguiding plate 8 and the slides 4 and 6 on the guiding plate 9 thislatter being embodiedv in the main slide.

The machine or the slide is driven from pulley 10 by the pressure cams12, 13, 14, keyed on shaft 11 journaled in the frame in line with theslides, the two cams 12, 14 serving to operatethe main slide and the cam13 serving to operate the piercing element slide. On the shaft 16arranged in the machine frame 15 above the rear ends of the slides threelevers 17, 18, 19 are suspended. The heads of the levers stand betweenthe slides and the pressure cams and the hitter are ,provided on thesurface turned towards the slides with hardened pressing pieces 20,rollers 21 being arranged on the opposite side facing the pressure incontact with the rollers 21 of the levers- 17, 18, 19, and thereby causethe rollers and also the slides to advance, Through their shaft 1G, thelevers 17, 18, 19 completely intercept the pressure of the cams actingin downwardly inclined direction so that mere- 1y the pressure of thelever heads acting in substantially axial direction is transferred tothe slides. In other words' each element mounted on the hearing 16 has aportion extending between the slides and said cams and is operable underthe inuenee of the cams so as to obtain a direct action from the camsthrough the interposed or intermediate members or elements to the slidesin a line substantially parallel to the slides. "The result is thatthese elements 17, 18 and 19 being arranged between the cams and therear ends of the tool slide eliminate all lateral friction otherwisecaused by the downwardly inclined pressure of the cams with regard tothe slides. The elimination sov of lateral friction and consequently ofside wear on the slides is of special importance in nut presses onaccount of the piercer carrying slide being located in the punchcarrying slide. An wear on either of these slides will affect t eposition of the tools carried by the slides and throw them out ofcenter, and as the wear on slides in vnut presses,

due to scale and water is well known, this elimination of Vfrictionresults in a very important improvement in the quality of the product.

lhe return of the slides is operated by means of the double-armed lever22 in such a manner that the cam 13, after havingadf/vanced the lever 18and thereby the slide "6, presses upon one arm of the lever 22 andpushes it downward, whereby the other arm of this lever, which acts onthe slides, pulls the slides 1, 6 back. The punch slide is carriedbackward by slide 1 until the former hits against the stop 23, the punchslide beling thereby brought into the proper working osition with regardto the other slides. e rollers 21 shown in the drawin'nfs and described'above might be omitted although they ensuref an especially smoothworking of the press.

It would further be possible to provide the mechanism described only forone ofthe `two slides for ensuring the same against on said frame,intermediate-elements `mov-- ably mounted on said bearing, each having aportion extending between the slides and' said cams and-operable underinfluence of the cams to obtain a direct action from the cams throughthe intermediate elements to the slides in a line substantially parallelto the slides.

In testimony whereof I aix my signature.

ALFRED 15E FRIES.

